Bunların hiçbiri

İ know it mean something like 'none of these' but i would appreciate if you can give me some sentences for example with that word 'bunların hiçbiri / onların hiç biri' in turkish... asking myself when to use it?

Bunların hiçbiri ucuz değil : None of these are cheap. (literally : None of these aren't cheap). That's how Turkic languages work. While it may seem like the sentence is telling you that all of these are cheap, it in fact tells you that none of these are cheap. That's something philosophical inTurkic languages and it's got something to do with Mathematics.